Does anyone know how to optimize the processing + rendering speed of a report that only includes time-series line charts. I currently have a report that holds 3 line charts that perpetually grow as new data is feed into the database. Currently it takes about 10-12s in total to execute the report; 2s for Data Retrieval, 4.4s for Processing and 5.3s for Rendering. I imagine it will only get worst as my database grows.

you need to first analyze the query behind and see how you can optimize it. Analyse the execution plan and then see costly steps. See if it has any missing indexes etc. B/w is your datasource relational table or cube?